845649644 has 36 divisors (see below), whose sum is σ = 1812114360. Its totient is φ = 343344960.

The previous prime is 845649643. The next prime is 845649647. The reversal of 845649644 is 446946548.

It is a junction number, because it is equal to n+sod(n) for n = 845649592 and 845649601.

It is not an unprimeable number, because it can be changed into a prime (845649643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109817 + ... + 117264.

It is an arithmetic number, because the mean of its divisors is an integer number (50336510).

Almost surely, 2^845649644 is an apocalyptic number.

It is an amenable number.

845649644 is an abundant number, since it is smaller than the sum of its proper divisors (966464716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

845649644 is a wasteful number, since it uses less digits than its factorization.

845649644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227118 (or 227109 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 50.

The square root of 845649644 is about 29080.0557771129. The cubic root of 845649644 is about 945.6494118698.

The spelling of 845649644 in words is "eight hundred forty-five million, six hundred forty-nine thousand, six hundred forty-four".